Close of play scorespublished at 19:10 British Summer Time 18 May
Division One:
- Durham 664 v Notts 407 & 67-1 – Notts trail by 190 runs
- Somerset 338 & 150-5 v Sussex 152 & 335 – Somerset win by five wickets
- Surrey 512 v Yorkshire 255 & 185-6 – Yorkshire trail by 72 runs
- Warks 194 & 220 v Hampshire 300 & 203 – Hampshire win by 89 runs
- Worcs 358 & 134 v Essex 157 & 110 – Worcs win by 225 runs
Division Two:
- Glamorgan 424 & 66-2 v Northants 185 & 304 – Glamorgan win by eight wickets
- Glos 516 v Kent 424 & 135-4 – Kent lead by 43 runs
- Lancashire 458 & 141-6 v Derbyshire 314 – Lancs lead by 285 runs
- Middlesex 232 & 143 v Leics 274 & 102-3 – Leics win by seven wickets